256581383185652 has 24 divisors (see below), whose sum is σ = 513266793156096. Its totient is φ = 109941158482848.

The previous prime is 256581383185651. The next prime is 256581383185657.

It is a happy number.

256581383185652 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256581383185651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 928669988 + ... + 928946235.

It is an arithmetic number, because the mean of its divisors is an integer number (21386116381504).

Almost surely, 2^{256581383185652} is an apocalyptic number.

It is an amenable number.

256581383185652 is an abundant number, since it is smaller than the sum of its proper divisors (256685409970444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256581383185652 is a wasteful number, since it uses less digits than its factorization.

256581383185652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857621167 (or 1857621165 counting only the distinct ones).

The product of its digits is 414720000, while the sum is 68.

The spelling of 256581383185652 in words is "two hundred fifty-six trillion, five hundred eighty-one billion, three hundred eighty-three million, one hundred eighty-five thousand, six hundred fifty-two".